两个方法：
String username = req.getParameter("username");
String[] hobbys = req.getParameterValues("hobbys");
前端代码：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录</title>
</head>
<body>
<h1>登录</h1>
<div style="text-align:center" >
<%-- 提交到Login --%>
<form action="${pageContext.request.contextPath}/Login" method="post">
用户名：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
爱好：
<input type="checkbox" name="hobbys" value="女孩">女孩
<input type="checkbox" name="hobbys" value="代码">代码
<input type="checkbox" name="hobbys" value="游戏">游戏
<input type="checkbox" name="hobbys" value="通宵打游戏">通宵打游戏
<input type="submit">
</form>
</div>
</body>
</html>
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setCharacterEncoding("utf-8");
String username = req.getParameter("username");
String password = req.getParameter("password");
String[] hobbys = req.getParameterValues("hobbys");
System.out.println(username);
System.out.println(password);
System.out.println(Arrays.toString(hobbys));
req.getRequestDispatcher("/success.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}注册为Login
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee
https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
version="5.0"
metadata-complete="true">
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.gao.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/Login</url-pattern>
</servlet-mapping>
</web-app>
最后转义或重定向为success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录成功，重定义</title>
</head>
<body>
<h1>登录成功</h1>
</body>
</html>
测试：
别忘了部署Tomcat